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Grid/Hadrons/Modules/MDistil/LapEvec.hpp

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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: Hadrons/Modules/MDistil/LapEvec.hpp
Copyright (C) 2019
Author: Felix Erben <ferben@ed.ac.uk>
Author: Michael Marshall <Michael.Marshall@ed.ac.uk>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
See the full license in the file "LICENSE" in the top level distribution directory
*************************************************************************************/
/* END LEGAL */
#ifndef Hadrons_MDistil_LapEvec_hpp_
#define Hadrons_MDistil_LapEvec_hpp_
#include <Hadrons/Global.hpp>
#include <Hadrons/Module.hpp>
#include <Hadrons/ModuleFactory.hpp>
#include <Hadrons/EigenPack.hpp>
// These are members of Distillation
#include <Hadrons/Distil.hpp>
BEGIN_HADRONS_NAMESPACE
BEGIN_MODULE_NAMESPACE(MDistil)
/******************************************************************************
Laplacian eigenvectors - parameters
******************************************************************************/
struct StoutParameters: Serializable {
GRID_SERIALIZABLE_CLASS_MEMBERS(StoutParameters,
int, steps,
double, rho)
StoutParameters() = default;
template <class ReaderClass> StoutParameters(Reader<ReaderClass>& Reader){read(Reader,"StoutSmearing",*this);}
};
struct ChebyshevParameters: Serializable {
GRID_SERIALIZABLE_CLASS_MEMBERS(ChebyshevParameters,
int, PolyOrder,
double, alpha,
double, beta)
ChebyshevParameters() = default;
template <class ReaderClass> ChebyshevParameters(Reader<ReaderClass>& Reader){read(Reader,"Chebyshev",*this);}
};
struct LanczosParameters: Serializable {
GRID_SERIALIZABLE_CLASS_MEMBERS(LanczosParameters,
int, Nvec,
int, Nk,
int, Np,
int, MaxIt,
double, resid,
int, IRLLog)
LanczosParameters() = default;
template <class ReaderClass> LanczosParameters(Reader<ReaderClass>& Reader){read(Reader,"Lanczos",*this);}
};
// These are the actual parameters passed to the module during construction
struct LapEvecPar: Serializable {
GRID_SERIALIZABLE_CLASS_MEMBERS(LapEvecPar
,std::string, gauge
,StoutParameters, Stout
,ChebyshevParameters, Cheby
,LanczosParameters, Lanczos)
};
/******************************************************************************
Laplacian eigenvectors - Module (class) definition
******************************************************************************/
template <typename GImpl>
class TLapEvec: public Module<LapEvecPar>
{
public:
GAUGE_TYPE_ALIASES(GImpl,);
// constructor
TLapEvec(const std::string name);
// destructor
virtual ~TLapEvec(void);
// dependency relation
virtual std::vector<std::string> getInput(void);
virtual std::vector<std::string> getOutput(void);
// setup
virtual void setup(void);
// execution
virtual void execute(void);
protected:
// These variables are created in setup() and freed in Cleanup()
GridCartesian * gridLD; // Owned by me, so I must delete it
GridCartesian * gridHD; // Owned by environment (so I won't delete it)
std::string sGaugeName;
protected:
virtual void Cleanup(void);
};
MODULE_REGISTER_TMP(LapEvec, TLapEvec<GIMPL>, MDistil);
/******************************************************************************
TLapEvec implementation
******************************************************************************/
// constructor /////////////////////////////////////////////////////////////////
template <typename GImpl>
TLapEvec<GImpl>::TLapEvec(const std::string name) : gridLD{nullptr}, Module<LapEvecPar>(name)
{
}
// destructor /////////////////////////////////////////////////////////////////
template <typename GImpl>
TLapEvec<GImpl>::~TLapEvec()
{
Cleanup();
}
// dependencies/products ///////////////////////////////////////////////////////
template <typename GImpl>
std::vector<std::string> TLapEvec<GImpl>::getInput(void)
{
sGaugeName = par().gauge;
if( sGaugeName.size() == 0 ) {
sGaugeName = getName();
sGaugeName.append( "_gauge" );
}
return std::vector<std::string>{ sGaugeName };
}
template <typename GImpl>
std::vector<std::string> TLapEvec<GImpl>::getOutput(void)
{
std::vector<std::string> out = {getName()}; // This is the higher dimensional eigenpack
return out;
}
// setup ///////////////////////////////////////////////////////////////////////
template <typename GImpl>
void TLapEvec<GImpl>::setup(void)
{
Cleanup();
Environment & e{env()};
gridHD = e.getGrid();
gridLD = MakeLowerDimGrid( gridHD );
const int Ntlocal{gridHD->LocalDimensions()[Tdir]};
// Temporaries
envTmpLat(GaugeField, "Umu_stout");
envTmpLat(GaugeField, "Umu_smear");
envTmp(LatticeGaugeField, "UmuNoTime",1,LatticeGaugeField(gridLD));
envTmp(LatticeColourVector, "src",1,LatticeColourVector(gridLD));
envTmp(std::vector<LapEvecs>, "eig",1,std::vector<LapEvecs>(Ntlocal));
// Output objects
envCreate(LapEvecs, getName(), 1, par().Lanczos.Nvec, gridHD );
}
// clean up any temporaries created by setup (that aren't stored in the environment)
template <typename GImpl>
void TLapEvec<GImpl>::Cleanup(void)
{
if( gridLD != nullptr ) {
delete gridLD;
gridLD = nullptr;
}
gridHD = nullptr;
}
/******************************************************************************
Calculate low-mode eigenvalues of the Laplacian
******************************************************************************/
// execution ///////////////////////////////////////////////////////////////////
template <typename GImpl>
void TLapEvec<GImpl>::execute(void)
{
const ChebyshevParameters &ChebPar{par().Cheby};
const LanczosParameters &LPar{par().Lanczos};
// Disable IRL logging if requested
LOG(Message) << "IRLLog=" << LPar.IRLLog << std::endl;
const int PreviousIRLLogState{GridLogIRL.isActive()};
GridLogIRL.Active( LPar.IRLLog == 0 ? 0 : 1 );
// Stout smearing
envGetTmp(GaugeField, Umu_smear);
Umu_smear = envGet(GaugeField, sGaugeName); // The smeared field starts off as the Gauge field
LOG(Message) << "Initial plaquette: " << WilsonLoops<PeriodicGimplR>::avgPlaquette(Umu_smear) << std::endl;
const StoutParameters &Stout{par().Stout};
if( Stout.steps )
{
envGetTmp(GaugeField, Umu_stout);
Smear_Stout<PeriodicGimplR> LS(Stout.rho, Tdir); // spatial smearing only
for (int i = 0; i < Stout.steps; i++) {
LS.smear(Umu_stout, Umu_smear);
Umu_smear = Umu_stout;
}
LOG(Message) << "Smeared plaquette: " << WilsonLoops<PeriodicGimplR>::avgPlaquette(Umu_smear) << std::endl;
}
////////////////////////////////////////////////////////////////////////
// Invert Peardon Nabla operator separately on each time-slice
////////////////////////////////////////////////////////////////////////
auto & eig4d = envGet(LapEvecs, getName() );
envGetTmp(std::vector<LapEvecs>, eig); // Eigenpack for each timeslice
envGetTmp(LatticeGaugeField, UmuNoTime); // Gauge field without time dimension
envGetTmp(LatticeColourVector, src);
const int Ntlocal{gridHD->LocalDimensions()[Tdir]};
const int Ntfirst{gridHD->LocalStarts()[Tdir]};
uint32_t ConvergenceErrors{0};
for(int t = 0; t < Ntlocal; t++ ) {
LOG(Message) << "------------------------------------------------------------" << std::endl;
LOG(Message) << " Compute eigenpack, local timeslice = " << t << " / " << Ntlocal << std::endl;
LOG(Message) << "------------------------------------------------------------" << std::endl;
eig[t].resize(LPar.Nk+LPar.Np,gridLD);
// Construct smearing operator
ExtractSliceLocal(UmuNoTime,Umu_smear,0,t,Tdir); // switch to 3d/4d objects
LinOpPeardonNabla<LatticeColourVector> PeardonNabla(UmuNoTime);
LOG(Debug) << "Chebyshev preconditioning to order " << ChebPar.PolyOrder
<< " with parameters (alpha,beta) = (" << ChebPar.alpha << "," << ChebPar.beta << ")" << std::endl;
Chebyshev<LatticeColourVector> Cheb(ChebPar.alpha,ChebPar.beta,ChebPar.PolyOrder);
// Construct source vector according to Test_dwf_compressed_lanczos.cc
src = 11.0; //TODO: Why hard-coded 11?
RealD nn = norm2(src);
nn = Grid::sqrt(nn);
src = src * (1.0/nn);
LinOpPeardonNablaHerm<LatticeColourVector> PeardonNablaCheby(Cheb,PeardonNabla);
ImplicitlyRestartedLanczos<LatticeColourVector>
IRL(PeardonNablaCheby,PeardonNabla,LPar.Nvec,LPar.Nk,LPar.Nk+LPar.Np,LPar.resid,LPar.MaxIt);
int Nconv = 0;
IRL.calc(eig[t].eval,eig[t].evec,src,Nconv);
if( Nconv < LPar.Nvec ) {
// NB: Can't assert here since we are processing local slices - i.e. not all nodes would assert
ConvergenceErrors = 1;
LOG(Error) << "MDistil::LapEvec : Not enough eigenvectors converged. If this occurs in practice, we should modify the eigensolver to iterate once more to ensure the second convergence test does not take us below the requested number of eigenvectors" << std::endl;
}
if( Nconv != LPar.Nvec )
eig[t].resize( LPar.Nvec, gridLD );
RotateEigen( eig[t].evec ); // Rotate the eigenvectors into our phase convention
for (int i=0;i<LPar.Nvec;i++){
InsertSliceLocal(eig[t].evec[i],eig4d.evec[i],0,t,Tdir);
if(t==0 && Ntfirst==0)
eig4d.eval[i] = eig[t].eval[i]; // TODO: Discuss: is this needed? Is there a better way?
}
}
GridLogIRL.Active( PreviousIRLLogState );
gridHD->GlobalSum(ConvergenceErrors);
assert(ConvergenceErrors==0 && "The eingensolver failed to find enough eigenvectors on at least one node");
#if DEBUG
// Now write out the 4d eigenvectors
eig4d.record.operatorXml = "<OPERATOR>Distillation</OPERATOR>";
eig4d.record.solverXml = "<SOLVER>CG</SOLVER>";
std::string sEigenPackName(getName());
sEigenPackName.append(".");
sEigenPackName.append(std::to_string(vm().getTrajectory()));
eig4d.write(sEigenPackName,false);
#endif
}
END_MODULE_NAMESPACE
END_HADRONS_NAMESPACE
#endif // Hadrons_MDistil_LapEvec_hpp_
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